1999 Chevy Blazer oil cooler lines

the oil cooler lines on my blazer are leaking how hard is it to replace these lines.

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Sunday, October 5th, 2008 AT 11:10 AM

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Removal Procedure
1.Raise and suitably support vehicle.
2.Remove the engine oil cooler lines support clamp bolt. Pic 1
Important: Have a drain pan ready for the engine oil to drain into.
3.Remove the bolt attaching the engine oil cooler lines to the oil filter adapter. Pic 2
4.Hold the cooler lines below the bottom of the radiator to drain the engine oil.
5.Remove and discard the seals.
6.Lower vehicle.
7.Remove air cleaner assembly.
8.Remove the engine oil cooler line retaining rings from the engine oil cooler line quick connectors at the radiator engine oil cooler inlet and outlet. Follow the next two steps for the proper retaining ring removal procedure. Pic 3
9.Using a bent-tip screwdriver or equivalent, pull on one of the open ends of the retaining ring in order to rotate the retaining ring. Pic 4
10.Rotate the retaining ring around the quick connector until the retaining ring is out of position and can be completely removed. Discard the retaining rings.
11.Remove the engine oil cooler lines from the quick connectors at the radiator engine oil cooler inlet and outlet. Pull the lines straight out from the connectors. Pic 5
12.Clean all of the components in a suitable solvent, and dry them with compressed air.
13.Inspect the fittings, the connectors, the cooler lines, and the cooler for damage, distortion, or restriction. Replace parts as necessary.
14.Flush the engine oil cooler and engine oil cooler lines with the same type of engine oil normally circulating through the engine.
Installation Procedure

Important: When performing the following procedure, do not reuse the old retaining rings. Replace the old retaining rings with new ones.
Do not install the new retaining ring onto the fitting by pushing the retaining ring down over the fitting. Pic 6
Install a new retaining ring (E-clip) into each quick connector at the radiator engine oil cooler by following the next three steps. Pic 7
2.Hook one of the open ends of the retaining ring in one of the slots in the quick connector. Pic 8
3.Rotate the retaining ring around the connector until the retaining ring is positioned with all three ears through the three slots. Pic 9
4.Ensure the three retaining ring ears can be seen from the inside of the connector and the retaining ring can move freely in the slots.
5.Install the engine oil cooler lines into the quick connectors at the radiator engine oil cooler inlet and outlet until a click is heard or felt. Pull back on the engine oil cooler lines to ensure a proper connection. Pic 5
6.Install air cleaner assembly.
7.Raise and s Install new seals on the engine oil cooler lines at the engine oil filter adapter ends. Pic 10
8.Suitably support vehicle.
9.Install the bolt attaching the engine oil cooler lines to the engine oil filter adapter. Pic 1
" Tighten the bolt to 35 Nm (26 ft. lbs.) .
10.Install the attaching clamp and the bolt.
" Tighten the bolt to 10 Nm (89 inch lbs.) .
11.Inspect and fill the engine oil to the proper level.
12.Start the engine and check for leaks.
13.Lower vehicle.